scholarly journals Effect of ZrO2 Addition on Vickers Hardness of Modified Basalt Glass-Ceramics

2007 ◽  
Vol 115 (1343) ◽  
pp. 429-433 ◽  
Author(s):  
Fatma Hassan MARGHA ◽  
Salwa Abdel-Hameed Mohamed ABDEL-HAMEED ◽  
Shigeru KATO ◽  
Shigeo SATOKAWA ◽  
Toshinori KOJIMA
Keyword(s):  
Vickers Hardness ◽  
Glass Ceramics ◽  
Basalt Glass

scholarly journals Impact of Morphology and Microstructure on the Mechanical Properties of Ge-As-Pb-Se Glass Ceramics

2020 ◽  
Vol 10 (8) ◽  
pp. 2836 ◽  
Author(s):  
Rashi Sharma ◽  
Rebecca Welch ◽  
Myungkoo Kang ◽  
Claudia Goncalves ◽  
Cesar Blanco ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Vickers Hardness ◽  
Glass Ceramic ◽  
Volume Fraction ◽  
Glass Ceramics ◽  
Post Heat Treatment ◽  
Base Glass ◽  
Parent Glass ◽  
Crystal Phases

The impact of base glass morphology and post heat-treatment protocol on the mechanical properties (Vickers hardness and Young’s modulus) of a multi-component glass-ceramic was examined. Two parent chalcogenide glasses with identical composition but varying morphology (homogeneous and phase separated) were evaluated for their mechanical properties following identical thermal processing to induce crystallization. The nucleation and growth rates of the starting materials were compared for the two glasses, and the resulting crystal phases and phase fractions formed through heat treatment were quantified and related to measured mechanical properties of the glass ceramics. The presence of a Pb-rich amorphous phase with a higher crystal formation tendency in the phase-separated parent glass significantly impacted the volume fraction of the crystal phases formed after heat-treatment. Pb-rich cubic crystal phases were found to be dominant in the resulting glass ceramic, yielding a minor enhancement of the material’s mechanical properties. This was found to be less than a more moderate enhancement of mechanical properties due to the formation of the dominant needle-like As2Se3 crystallites resulting from heat treatment of the homogeneous, commercially melted parent glass. The greater enhancement of both Vickers hardness and modulus in this glass ceramic attributable to the high-volume fraction of anisotropic As2Se3 crystallites in the post heat-treated commercial melt highlights the important role base glass morphology can play on post heat-treatment microstructure.

Electronic conduction in basalt glass and glass-ceramics - correlation with magnetite crystallization

1987 ◽  
Vol 22 (10) ◽  
pp. 3602-3606 ◽  
Author(s):  
J. R. Jurado-Egea ◽  
A. E. Owen ◽  
A. K. Bandyopadhyay
Keyword(s):  
Glass Ceramics ◽  
Electronic Conduction ◽  
Basalt Glass

Magnetic properties of a basalt glass and glass-ceramics

1980 ◽  
Vol 40 (1-3) ◽  
pp. 353-368 ◽  
Author(s):  
A.K Bandyopadhyay ◽  
J Zarzycki ◽  
P Auric ◽  
J Chappert
Keyword(s):  
Magnetic Properties ◽  
Glass Ceramics ◽  
Basalt Glass

scholarly journals Surface properties of a new lithium disilicate glass-ceramic after grinding

2021 ◽  
Vol 32 (9) ◽  
Author(s):  
Larissa Natiele Miotto ◽  
Mariana de Oliveira Carlos Villas-Bôas ◽  
Edgar Dutra Zanotto ◽  
Eduardo Bellini Ferreira ◽  
Laiza Maria Grassi Fais ◽  
...  
Keyword(s):  
Surface Energy ◽  
Surface Properties ◽  
Vickers Hardness ◽  
Sessile Drop ◽  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Optical Profilometry ◽  
X Ray Diffraction ◽  
Final Thickness ◽  
The Mean

AbstractThis study aimed to evaluate the effect of grinding on some surface properties of two lithium disilicate-based glass-ceramics, one experimental new product denominated LaMaV Press (UFSCar-Brazil) and another commercial known as IPS e-max Press (Ivoclar), in the context of simulated clinical adjustment. Discs (N = 24, 12 mm in diameter) were separated into four groups: LaMaV Press with no grinding (E), LaMaV Press after grinding (EG), IPS e-max Press with no grinding (C), and IPS e-max Press after grinding (CG). A 0.1-mm deep grinding was carried out on EG and CG samples (final thickness of 1.4 mm) using a diamond stone in a low-speed device. The E and C samples had the same thickness. The effect of grinding on the sample surfaces was evaluated by X-ray diffraction, mechanical and optical profilometry, scanning electron microscopy, goniometry, and Vickers hardness. The mean roughness (Ra) was evaluated by Kruskal–Wallis and Student–Newman–Keuls statistics. The surface energy (SE) by the sessile drop method and Vickers hardness (VH) were analyzed using two-way ANOVA. The Ra medians were E = 1.69 µm, EG = 1.57 µm, C = 1.45 µm, and CG = 1.13 µm with p = 0.0284. The SE and VH were similar for all materials and treatments. Grinding smoothed the surfaces and did not significantly alter the hardness and surface energy of both LaMaV Press and IPS e-max Press. These glass-ceramics presented similar surface properties, and clinical adjustments can be implemented without loss of performance of both materials.

scholarly journals Preparation and Characterization of High-Strength Glass-Ceramics via Ion-Exchange Method

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5477
Author(s):  
Jianwei Lu ◽  
Haifeng Wang ◽  
Juanjuan Zhu ◽  
Qiuju Zheng ◽  
Linfeng Ding ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Ion Exchange ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
Glass Ceramics ◽  
High Strength ◽  
Aluminosilicate Glass ◽  
Exchange Method ◽  
The Impact

Lithium aluminosilicate glass-ceramics (LAS GCs) are ideal shell materials for mobile phones; however, the mechanical properties of LAS GCs are comparatively lower than that of other shell materials. In this work, the impact of TiO2/(TiO2 + ZrO2) ratio on properties of LAS GCs was studied and the ion-exchange methods were applied to improve the mechanical properties of LAS GCs. The results show that LAS GCs with TiO2/(TiO2 + ZrO2) = 1/2 exhibit the best flexural strength (109 MPa) and Vickers hardness (525 Kg/mm2). The as-prepared glass was nucleated at 560 °C for 1 h and crystallized at 720 °C for 0.5 h. The main crystalline phases of LAS GCs are β-quartz solid solution, β-spodumene solid solution, and Li2SiO3. Moreover, the flexural strength and Vickers hardness of LAS GCs with TiO2/(TiO2 + ZrO2) = 1/2 further increased to 356 MPa and 838 Kg/mm2 after an ion-exchange at 420 °C for 6 h in pure KNO3 molten salt. The LAS GCs with enhanced mechanical strength have the potential to be applied as mobile phone back panels.

The Effect of SiO2, TiO2, and B2O3 on the Crystallization of Glass-Ceramics Glaze Properties

2016 ◽  
Vol 690 ◽  
pp. 206-211 ◽  
Author(s):  
Lada Punsukumtana ◽  
Sansanee Rugthaicharoencheep ◽  
Usuma Naknikham ◽  
Netnapha Suphanam
Keyword(s):  
Vickers Hardness ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
High Hardness ◽  
Sintering Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ceramic Glaze ◽  
Industry Applications ◽  
Firing History

The feasibility of developing glass-ceramic glaze in the system KNaO-CaO-MgO-ZnO with a variation in the composition of SiO2, TiO2, and B2O3 was studied. The SiO2, TiO2, and B2O3 were varied in the amount of 2.25-1.50, 0.001-0.10, and 0-0.1 molar equivalents respectively. The samples were one fired at 1180°C or double fired by reheat at the crystallization temperature for 10 minutes. The gloss, sintering behavior, phase, microstucture, and hardness, and were examined by glossmeter, side-view hot stage microscope, X-ray diffraction, SEM, and Vickers hardness respectively. The results showed the importance effect of SiO2, TiO2, and B2O3 on the glaze crystallization ability and its properties. At the fix value of Al2O3 at 0.24 molar equivalents and with the 0.001-0.10 molar equivalents of TiO2, lower the SiO2 content to 1.50 molar equivalents increased the glaze crystallization potential. An increase in the B2O3 to 0.1 molar equivalents suppressed the potential of glaze crystallization. The phases of samples were amorphous or composed of silicon dioxide and diopside as the main phases depending on the glaze composition and the firing history. In this study, the glaze appearances transparent to opaque and varied from gloss to matte with the specular gloss values between 23-100 GU. All samples appeared to have high Vickers hardness value in the range of 553-644. The crystallization decreased the gloss but increased the hardness value for the 2.25 molar equivalents SiO2 glaze. Finally, a composition with high hardness and high gloss was identified and its properties was also presented. These results suggested the limitation and the potential for applying this glass-ceramic glaze system to industry applications.

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